CN114486776A - Method for testing mercury content in graphite negative electrode material of lithium ion battery - Google Patents
Method for testing mercury content in graphite negative electrode material of lithium ion battery Download PDFInfo
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- CN114486776A CN114486776A CN202111678587.8A CN202111678587A CN114486776A CN 114486776 A CN114486776 A CN 114486776A CN 202111678587 A CN202111678587 A CN 202111678587A CN 114486776 A CN114486776 A CN 114486776A
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- 229910052753 mercury Inorganic materials 0.000 title claims abstract description 33
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012360 testing method Methods 0.000 title claims abstract description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 20
- 239000010439 graphite Substances 0.000 title claims abstract description 20
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 14
- 239000007773 negative electrode material Substances 0.000 title claims description 3
- 239000000523 sample Substances 0.000 claims abstract description 31
- 239000000243 solution Substances 0.000 claims abstract description 28
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 16
- 150000004678 hydrides Chemical class 0.000 claims abstract description 16
- 239000012074 organic phase Substances 0.000 claims abstract description 15
- 239000010406 cathode material Substances 0.000 claims abstract description 14
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 238000001479 atomic absorption spectroscopy Methods 0.000 claims abstract description 11
- 239000000706 filtrate Substances 0.000 claims abstract description 11
- 239000012488 sample solution Substances 0.000 claims abstract description 11
- 239000012286 potassium permanganate Substances 0.000 claims abstract description 10
- 239000008367 deionised water Substances 0.000 claims abstract description 9
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 9
- 239000011521 glass Substances 0.000 claims abstract description 9
- VSWDORGPIHIGNW-UHFFFAOYSA-N Pyrrolidine dithiocarbamic acid Chemical compound SC(=S)N1CCCC1 VSWDORGPIHIGNW-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000012071 phase Substances 0.000 claims abstract description 8
- -1 pyrrolidine dithiocarbamate amine Chemical class 0.000 claims abstract description 8
- 239000007864 aqueous solution Substances 0.000 claims abstract description 7
- 239000012496 blank sample Substances 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000010405 anode material Substances 0.000 claims 2
- 239000000843 powder Substances 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 6
- 239000011159 matrix material Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 230000010355 oscillation Effects 0.000 abstract 2
- 239000003153 chemical reaction reagent Substances 0.000 description 11
- 238000010521 absorption reaction Methods 0.000 description 7
- 238000011084 recovery Methods 0.000 description 7
- 239000012086 standard solution Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 4
- 239000003575 carbonaceous material Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000012279 sodium borohydride Substances 0.000 description 3
- 229910000033 sodium borohydride Inorganic materials 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 238000001636 atomic emission spectroscopy Methods 0.000 description 1
- 239000012490 blank solution Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/3103—Atomic absorption analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pathology (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a method for testing mercury content in a graphite cathode material of a lithium ion battery, which relates to the technical field of battery material detection and comprises the following steps: crushing a graphite cathode material, adding concentrated hydrochloric acid and deionized water, heating for dissolving, and filtering to obtain a filtrate; adding an aqueous solution of pyrrolidine dithiocarbamate into the filtrate, uniformly mixing by oscillation, then adding methyl isobutyl ketone, uniformly mixing by oscillation, standing for layering, removing the water phase, and collecting the organic phase; transferring the organic phase into a glass volumetric flask, adopting methyl isobutyl ketone to perform constant volume, and adding a few drops of potassium permanganate solution before performing constant volume to serve as a sample solution to be detected; preparing a blank sample solution and a standard sample solution, and measuring by using a hydride atomic absorption spectrometry. The invention relates to the preparation of pyrrolidine dithiocarbamate amine and methyl isobutyl ketoneIn use, Hg is added2+The sample is transferred from the sample matrix, so that serious matrix interference is avoided, and the stability and accuracy of detection are improved.
Description
Technical Field
The invention relates to the technical field of battery material detection, in particular to a method for testing mercury content in a graphite cathode material of a lithium ion battery.
Background
Since Sony corporation developed carbon materials as negative electrodes for lithium ion batteries, the capacity of the batteries has been increasing, largely due to the continuous improvement in the performance of the carbon materials. Graphite is one of the most studied carbon materials of lithium ion batteries, and comprises natural graphite, artificial graphite and various graphitized carbons, and because the substances are all from natural resources, various toxic and harmful substances, such as heavy metals and the like, are brought, and the harm to mercury in the heavy metals is the greatest. The GB/T30836-2014 standard therefore specifies the limits for mercury and its compounds.
The detection methods of mercury and its compounds are many, such as: a hydride-ICP method, a hydride-ICPMS method, a cold atomic absorption method (hydride atomic absorption), and the like. Among them, the hydride-ICP method has the advantages of fast analysis speed and wide linear range, but the instrument is expensive to use, and the method belongs to atomic emission spectroscopy, and its spectral line interference is serious. The hydride-ICPMS method also has the advantages of high analysis speed and wide linear range, but the use cost of the instrument is higher. Compared with the former two methods, the cold atomic absorption method has the advantages of low instrument use cost, high analysis speed, small spectral line interference, high test accuracy and low detection limit. However, in the prior art, the mercury content is measured by using a cold atomic absorption method, the pretreatment of a sample is relatively simple, the mercury content is generally directly measured after being dissolved in acid, and other components in the raw materials have certain interference on the measurement.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a method for testing the mercury content in a graphite cathode material of a lithium ion battery.
The invention provides a method for testing mercury content in a graphite electrode material of a lithium ion battery, which comprises the following steps:
s1, crushing the graphite cathode material, adding concentrated hydrochloric acid and deionized water, heating for dissolving, and filtering to obtain a filtrate;
s2, adding the aqueous solution of pyrrolidine dithiocarbamate into the filtrate, oscillating and mixing uniformly, then adding methyl isobutyl ketone, oscillating and mixing uniformly, standing for layering, removing the water phase, and collecting the organic phase;
s3, transferring the organic phase into a glass volumetric flask, fixing the volume by adopting methyl isobutyl ketone, and adding a proper amount of potassium permanganate solution for reducing mercury ions before fixing the volume to serve as a sample solution to be detected;
s4, preparing a blank sample solution and a standard sample solution, measuring by using a hydride atomic absorption spectrometry, and drawing a standard curve; and (4) determining the content of mercury in the solution of the sample to be detected by using the obtained standard curve and then by using a hydride atomic absorption spectrometry.
Preferably, the method comprises the following steps:
s1, crushing 0.500-1.000g of graphite cathode material, adding 10mL of concentrated hydrochloric acid and 20mL of deionized water, heating for dissolving, and filtering to obtain filtrate;
s2, adding 20mL of 2 wt% pyrrolidine dithiocarbamate aqueous solution into the filtrate, oscillating, mixing uniformly for reaction, then adding 20mL of methyl isobutyl ketone, oscillating, mixing uniformly, standing for layering, removing the water phase, and collecting the organic phase;
s3, transferring the organic phase into a 100mL glass volumetric flask, fixing the volume by adopting methyl isobutyl ketone, and adding a proper amount of potassium permanganate solution for reducing mercury ions before fixing the volume to serve as a sample solution to be detected;
s4, preparing a blank sample solution and a standard sample solution, measuring by using a hydride atomic absorption spectrometry, and drawing a standard curve; and (4) determining the content of mercury in the solution of the sample to be detected by using the obtained standard curve and then by using a hydride atomic absorption spectrometry.
Preferably, in S1, crushing to 100-200 mesh.
Preferably, in S3, the potassium permanganate solution has a concentration of 3 wt%.
Has the advantages that: according to the invention, a graphite cathode material sample is firstly dissolved by concentrated hydrochloric acid, and Hg and compounds thereof in the sample are converted into Hg2+Then the pyrrolidine dithiocarbamate, which is capable of reacting with Hg, is added2+Forming a complex, and reacting Hg in the complex with methyl isobutyl ketone2+And (4) extracting. The invention uses pyrrolidine dithiocarbamate amine and methyl isobutyl ketone to react Hg2+The sample is transferred from the sample matrix, so that serious matrix interference is avoided, and the stability and accuracy of detection are improved. The method is simple to operate, and has the advantages of good selectivity, less spectral line interference and analysis speed for measuring mercury in the graphite cathode materialThe method has the advantages of quickness, high accuracy and the like, and is suitable for measuring mercury in the graphite cathode material of the lithium ion battery.
Drawings
FIG. 1 is a standard graph of mercury in an example of the present invention.
Detailed Description
The instrument and the reagent used in the invention mainly comprise:
the instrument equipment comprises: AAS-900 atomic absorption spectrometer (platinummer usa), UPR-10T ultrapure water machine (sienna eupu), mercury hollow cathode lamp (beijing colored research institute), muffle furnace (synfex), ten thousandth electronic balance (mettlettodol), hydride generator (east-west analyzer);
reagents and solutions: nitric acid, top grade pure (68-70%) Chinese medicinal chemical reagent (Shanghai); mercury standard solution: 1000ug/ml, Beijing color institute; sodium borohydride, guaranteed reagent, alatin chemical reagent; deionized water with the resistivity more than or equal to 18 megaohm.cm; hydrochloric acid, guaranteed reagent, alatin chemical reagent; pyrrolidine dithiocarbamate, guaranteed reagent, alatin chemical; MIBK, guaranteed reagent, alatin chemical; potassium permanganate, guaranteed reagent, alatin chemical reagent.
The technical solution of the present invention will be described in detail below with reference to specific examples.
Examples
Firstly, preparation of standard solution
(1) 3% sodium borohydride solution: 3.000g of sodium borohydride was drawn into a 100ml glass volumetric flask and made to volume using deionized water, which is the reducing agent, for the hydride generator to react with the sample solution to produce mercury vapor.
(2) Mercury standard solution: the mercury standard solution (1000ug/ml) was diluted stepwise with deionized water to mercury standard solutions of concentrations of 10.0, 20.0, 30.0, and 40.0 ug/ml.
(3) Blank sample: adding 20mL of 2 wt% pyrrolidine dithiocarbamate amine aqueous solution, oscillating, mixing uniformly for reaction, then adding 20mL of methyl isobutyl ketone, oscillating, mixing uniformly, standing for layering, removing a water phase, collecting an organic phase, transferring the organic phase into a 100mL glass volumetric flask, carrying out constant volume by adopting the methyl isobutyl ketone, and adding 2-3 drops of potassium permanganate solution before constant volume to serve as a blank solution.
Secondly, processing the sample to be detected
(1) Weighing 0.500-1.000g of graphite cathode material sample crushed to more than 100 meshes, placing the sample in a beaker, adding 10mL of concentrated hydrochloric acid and 20mL of deionized water, heating and dissolving the sample on an electric hot plate, and filtering the sample by using filter paper after the sample is completely dissolved.
(2) 20ml of 2 wt% pyrrolidine dithiocarbamate aqueous solution was added to the filtrate, and mixed well to allow a sufficient reaction. And after the reaction is completed, transferring the reaction solution into a separating funnel, adding 20ml of MIBK solution, shaking up, standing, removing the water phase after the water phase and the organic phase are separated, and collecting the organic phase.
(3) And transferring the organic phase into a 100ml glass volumetric flask, and carrying out constant volume by using MIBK, wherein 2-3 drops of 3% potassium permanganate solution are added before constant volume, so that the solution is to-be-detected.
Determination of hydride atomic absorption spectrometry
Preparing a sample blank and a standard sample by adopting a solution adding method which is the same as that for preparing the solution to be detected, transferring the processed sample blank and the standard sample into a 100mL glass volumetric flask, and directly measuring the solution to be detected, the standard sample and the sample blank by using a hydride atomic absorption spectrometer.
The measurement conditions were as follows: the wavelength is 253.7nm, the spectral bandwidth is 0.4nm, the lamp current is 10mA, and the height of the combustion head is 13 mm.
Fourth, test results
1. The standard curves and sample test results are shown in table 1 (3 replicates for each sample).
Table 1 hydride atomic absorption spectroscopy test data
Standard curve equation: y is 0.007x +0.001 and R is 0.997.
2. Standard recovery test
The sample 1 was subjected to the standard recovery test, and the test data of the standard sample 1 are recorded as the test data of the standard sample 1 in table 2.
Table 2 recovery test data
| Sample (I) | Labeled sample 1 |
| Adding standard amount (ug/ml) | 20 |
| Test results (ug/ml) | 57.5 |
| Recovery (%) | 105.6 |
Through the standard recovery rate test, the test recovery rate of the sample 1 meets the test requirement, and the method has high accuracy.
The processing method is adopted to measure on a hydride atomic absorption spectrometer, the standard recovery rate is 95-110%, and the precision and the accuracy both meet the test of the mercury content in the cathode material, so the method is suitable for monitoring the harmful substance mercury in the cathode material of the lithium ion battery.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. A method for testing mercury content in a graphite cathode material of a lithium ion battery is characterized by comprising the following steps:
s1, crushing the graphite cathode material, adding concentrated hydrochloric acid and deionized water, heating for dissolving, and filtering to obtain a filtrate;
s2, adding the aqueous solution of pyrrolidine dithiocarbamate into the filtrate, oscillating and mixing uniformly, then adding methyl isobutyl ketone, oscillating and mixing uniformly, standing for layering, removing the water phase, and collecting the organic phase;
s3, transferring the organic phase into a glass volumetric flask, fixing the volume by adopting methyl isobutyl ketone, and adding a proper amount of potassium permanganate solution for reducing mercury ions before fixing the volume to serve as a sample solution to be detected;
s4, preparing a blank sample solution and a standard sample solution, measuring by using a hydride atomic absorption spectrometry, and drawing a standard curve; and (4) determining the content of mercury in the solution of the sample to be detected by using the obtained standard curve and then by using a hydride atomic absorption spectrometry.
2. The method for testing the mercury content in the graphite negative electrode material of the lithium ion battery according to claim 1, characterized by comprising the following steps:
s1, crushing 0.500-1.000g of graphite cathode material, adding 10mL of concentrated hydrochloric acid and 20mL of deionized water, heating for dissolving, and filtering to obtain filtrate;
s2, adding 20mL of 2 wt% pyrrolidine dithiocarbamate aqueous solution into the filtrate, oscillating, mixing uniformly for reaction, then adding 20mL of methyl isobutyl ketone, oscillating, mixing uniformly, standing for layering, removing the water phase, and collecting the organic phase;
s3, transferring the organic phase to a 100mL glass volumetric flask, fixing the volume by methyl isobutyl ketone, and adding a proper amount of potassium permanganate solution for reducing mercury ions before fixing the volume to serve as a sample solution to be detected;
s4, preparing a blank sample solution and a standard sample solution, measuring by using a hydride atomic absorption spectrometry, and drawing a standard curve; and (4) determining the content of mercury in the solution of the sample to be detected by using the obtained standard curve and then by using a hydride atomic absorption spectrometry.
3. The method for testing the mercury content in the graphite anode material of the lithium ion battery as claimed in claim 1 or 2, wherein in S1, the powder is crushed to 100-200 meshes.
4. The method for testing the mercury content in the graphite anode material of the lithium ion battery as claimed in claim 1 or 2, wherein in S3, the concentration of the potassium permanganate solution is 3 wt%.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0627024A (en) * | 1992-02-13 | 1994-02-04 | Meidensha Corp | Quantitative analysis of iron in electrolyte of zinc-bromine battery |
| CN1815198A (en) * | 2006-02-22 | 2006-08-09 | 北京吉天仪器有限公司 | Method for measuring lead in blood by using hydride generating atomic spectrum method |
| CN102262060A (en) * | 2010-05-27 | 2011-11-30 | 上海光谱仪器有限公司 | Method and device for analyzing heavy metal elements by on-line enrichment and atomic absorption spectrum |
| JP2014173878A (en) * | 2013-03-06 | 2014-09-22 | Central Research Institute Of Electric Power Industry | Method of preparing specimen for measuring mercury in coal ash and method of measuring mercury in coal ash |
| CN104777110A (en) * | 2015-03-18 | 2015-07-15 | 昆明理工大学 | Method for detecting trace cadmium and lead |
-
2021
- 2021-12-31 CN CN202111678587.8A patent/CN114486776A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0627024A (en) * | 1992-02-13 | 1994-02-04 | Meidensha Corp | Quantitative analysis of iron in electrolyte of zinc-bromine battery |
| CN1815198A (en) * | 2006-02-22 | 2006-08-09 | 北京吉天仪器有限公司 | Method for measuring lead in blood by using hydride generating atomic spectrum method |
| CN102262060A (en) * | 2010-05-27 | 2011-11-30 | 上海光谱仪器有限公司 | Method and device for analyzing heavy metal elements by on-line enrichment and atomic absorption spectrum |
| JP2014173878A (en) * | 2013-03-06 | 2014-09-22 | Central Research Institute Of Electric Power Industry | Method of preparing specimen for measuring mercury in coal ash and method of measuring mercury in coal ash |
| CN104777110A (en) * | 2015-03-18 | 2015-07-15 | 昆明理工大学 | Method for detecting trace cadmium and lead |
Non-Patent Citations (8)
| Title |
|---|
| 何慧娟等: "电感耦合等离子体发射光谱法测定锂离子电池石墨负极材料中铁不确定度评定", 《化学分析计量》, vol. 30, no. 05, pages 80 - 84 * |
| 刘英杰等: "石墨炉原子吸收法测量水中痕量汞", 《理化检验 化学分册》, vol. 27, no. 06, pages 359 - 360 * |
| 刘贵荣: "高锰酸钾对冷原子吸收法测定汞结果的影响", 《甘肃冶金》, vol. 41, no. 02, pages 101 - 103 * |
| 方晗琛等: "流动注射-氢化物发生-电热原子吸收光谱法测定水中痕量汞", 《理化检验-化学分册》, vol. 43, no. 12, pages 1068 - 1070 * |
| 李晓红等: "溶剂萃取-石墨炉原子吸收光谱法测定高盐分酱油中铅", 西北农业学报, vol. 18, no. 01, pages 255 - 257 * |
| 汤志勇等: "溶剂萃取-非水介质氢化物发生原子吸收法测定化探样品中痕量锡", 岩矿测试, no. 04, pages 357 * |
| 艾明: "氢化物发生－原子吸收光谱法测定食品中的汞", 《中国无机分析化学》, vol. 03, no. 01, pages 74 - 76 * |
| 陈晓东等: "有机基体改进剂添加的石墨炉原子吸收法测定汞的研究", 四川大学学报(工程科学版), vol. 32, no. 03, pages 91 - 93 * |
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